DES算法详细解析与CBC模式软实现

#include "windows_linux.h"    
#include "memory.h"    
#include "PSError.h"    
   
#define CRYPT_MODE_CBC          1       // Cipher block chaining    
#define CRYPT_MODE_ECB          2       // Electronic code book    
   
enum PADDING_MODE { PKCS1_PADDING=0, PKCS7_PADDING, ISO1_PADDING, ISO2_PADDING };   
   
enum {ENCRYPT, DECRYPT};   
   
typedef bool    (*PSubKey)[16][48];   
   
   
////////////////////////////////////////////////////////////////////////    
// initial permutation IP    
const BYTE IP_Table[64] = {   
    58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4,   
        62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8,   
        57, 49, 41, 33, 25, 17,  9, 1, 59, 51, 43, 35, 27, 19, 11, 3,   
        61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7   
};   
// final permutation IP^-1     
const BYTE IPR_Table[64] = {   
    40, 8, 48, 16, 56, 24, 64, 32, 39, 7, 47, 15, 55, 23, 63, 31,   
        38, 6, 46, 14, 54, 22, 62, 30, 37, 5, 45, 13, 53, 21, 61, 29,   
        36, 4, 44, 12, 52, 20, 60, 28, 35, 3, 43, 11, 51, 19, 59, 27,   
        34, 2, 42, 10, 50, 18, 58, 26, 33, 1, 41,  9, 49, 17, 57, 25   
};   
// expansion operation matrix    

const BYTE E_Table[48] = {   
    32,  1,  2,  3,  4,  5,  4,  5,  6,  7,  8,  9,   
        8,  9, 10, 11, 12, 13, 12, 13, 14, 15, 16, 17,   
        16, 17, 18, 19, 20, 21, 20, 21, 22, 23, 24, 25,   
        24, 25, 26, 27, 28, 29, 28, 29, 30, 31, 32,  1   
};   
// 32-bit permutation function P used on the output of the S-boxes     
const BYTE P_Table[32] = {   
    16, 7, 20, 21, 29, 12, 28, 17, 1,  15, 23, 26, 5,  18, 31, 10,   
        2,  8, 24, 14, 32, 27, 3,  9,  19, 13, 30, 6,  22, 11, 4,  25   
};   
// permuted choice table (key)     
const BYTE PC1_Table[56] = {   
    57, 49, 41, 33, 25, 17,  9,  1, 58, 50, 42, 34, 26, 18,   
        10,  2, 59, 51, 43, 35, 27, 19, 11,  3, 60, 52, 44, 36,   
        63, 55, 47, 39, 31, 23, 15,  7, 62, 54, 46, 38, 30, 22,   
        14,  6, 61, 53, 45, 37, 29, 21, 13,  5, 28, 20, 12,  4   
};   
// permuted choice key (table)     
const BYTE PC2_Table[48] = {   
    14, 17, 11, 24,  1,  5,  3, 28, 15,  6, 21, 10,   
        23, 19, 12,  4, 26,  8, 16,  7, 27, 20, 13,  2,   
        41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48,   
        44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32   
};   
// number left rotations of pc1     
const BYTE LOOP_Table[16] = {   
    1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1   
};   
// The (in)famous S-boxes